Treacherous Potions

by Hellticket

Rating: mature
Tags: Romance, Spike, Random, Sex, Twilight Sparkle, My Little Pony: Friendship is Magic
Length: 4605

Spike pilfers a potion from Twilight, unaware she's already drank a potion herself! (One-off Twi/Spike clop scene, futa, aphrodisiac, anal, cum inflation, etc)

Spike has a secret affinity for stealing Twilight's potions and experimenting with their effects. In the middle of being disoriented by a particular brew, he learns he's not alone in this endeavor.

(Just a clop fic, nothing more. CONTENT WARNINGS include: implied canon-age Spike [I never specify either way, but he is Little], disorientation/drug usage analogues, futa, anal, size difference, unrealistic penetrations, dub-con due to inebriation, double penetration, light cum inflation, rimming, uhh I think that about covers it)

Published 2014-04-24 14:40:03 UTC
Last updated 2014-04-24 14:40:03 UTC

Chapter 1

"Twilight's in the bath? Check. Owlyiousious is out on a supplies run? Check."

Spike's bobbing quill scrawled over the parchment in his clawed grip, narrowed eyes darting over its tawny surface. His checklist was complete! With a mischievous chuckle, a grin and an unceremonious flick of the wrist, the paper was discarded over his shoulder. Spike's chubby legs carried him forward; a cautious grip hefted the door before him's edge open just wide enough to peer into the room before him.

Twilight's apothecary was empty!

With silent satisfaction and excitement, he squeezed his form through as narrow an opening into the room as he, and his belly, could afford. Still, his pale green scutes dragged against its wooden edge a little, offering a slight bounce when he stumbled into the entrance, tail spade flicking against it. With that, Spike took a few moments to eye his surroundings -- countless rows of shimmering bottles stood before him, on tabletops and shelves, flasks and beakers full of countless substances. Viscous oozing liquids, bubbling restless liquids, shimmering opalescent liquids, some unidentifiable powders and such sitting on open bindles next to measuring spoons and tools that Spike could never hope to guess what accomplished. Twilight Sparkle's apothecary stood before Spike as a monument to the insatiable curiosity of his cohort and the quenchless pursuit of knowledge.

But to Spike, it stood before him as a lewd, hedonistic candy store!

His eyes narrowed, careful feet pushing him further into the room, flicking earfins carefully listening for the sound of approaching hoofbeats. He heard none (only the gentle fizzling of untold substances) and allowed a satisfied smirk to creep into his cheeks. Every moment that crept by imbued Spike with a little more bravery, a little more boldness; his steps grew from pensive tip-toes to restrained footfalls to casual steps over the course of his stride over to a potion table. He inspected the selection before him, thick forearms hefting the rest of him eye-level with the potions, and shuddered as he perused his options.

Truth be told, Spike was a secret fan of altered states, as it were. It had probably started a few seasons back, when with a wink and a nudge, Applejack let the young dragon steal a few healthy gulps of her cup of cider. For a while now he'd sneaked into Twilight's potions room and stolen clandestine sips of her brews just to see whatever odds effects they may have on his mind or body. One time, a particular potion shifted his perception of color and taste (that was a favorite!); another had given his scales a peculiar iridescent sheen. Nothing impressive had happened insofar, though, and it was that driving curiosity that drove Spike to continue to sneak sips of Twilight's experiments.

Especially after he saw to such degrees his pony friends' had their bodies altered, at times! It was with an odd fascination that he didn't sincerely understand that Spike recalled Fluttershy's numerous recent transformations, the morphing of his friends into Breezies. Spike didn't understand why he was so fascinated; all he knew was that something was driving him to continue to try potions until something big happened. Something more than prettier scales or spicy apples.

Some of the flasks before him had crude indicators of their apparent intended effects or ingredients; several more had chemical formulas written on their labels; Spike was hopeless to understand any of these. And to be honest? Part of him liked it that way; the thrill of the unexpected altering and shifting of his state of being certainly added to his lewd pleasure.

Gentle claws wrapped themselves around the neck of an Erlenmeyer flask, a thick, murky liquid fillings its innards. He plucked it carefully from the table, one hand around its neck and the other cradling its base. The ooze within it was a ruddy mulberry purple; he gently swirled the bottle, and the fluid shifted slowly, clinging greedily to the sides of the glass with fascinated eyes locked on its seeping paths. Spike shuddered with curiosity. He uncorked it, holding it up to his tiny snout to smell it. Sweet, saccharine, raspberries and sugar and perfume.

Without hesitation, Spike wrapped his lips around the flask's opening and threw it back, thick fluid flooding his small maw in short order. It was cloying and heavy, the kind of fluid one feels like they could chew as easily as they could swallow it! His cheeks filled, lumps bobbing rhythmically down his throat as he bravely gulped every ounce of the sticky potion he could manage. It was overwhelmingly sweet and filling him with warmth, like an alcoholic syrup. The fluid was so thick, he could feel each gulp feel like it swelled his stomach a little more, its presence palpable and heavy in his belly. A broad, eager forked tongue slipped into the flask, tugging and pressing to get everything he could!

With a satisfied sigh and a little pop, greedy lips released the bottle, a trail of mixed-up potion and saliva still connecting the mouth of the bottle and the dragon. Soft hands kneaded his belly, shifting the fullness as he licked his chops. Blinking with realization, Spike carefully returned the now-empty flask among is comrades. Through prior experiences, he knew better than to wait attentively and try to scry the potion's affects as they occurred; no, it was much better to ignore it and let it occur as it will, letting yourself see the flower in full bloom instead of studiously watching the bud unfurl.

Spike hurried back to the door, sitting with his back against it to listen for sudden intruders. As much as Twilight liked to tease him about the length of his baths, she was one to talk! He wasn't really worried about her intruding, that knowledge in hand, but it never hurt to be vigilant. His fat tail half-curled around one leg, meandering digits finding a resting spot on his belly. He let his eye fall half-lidded as he calmly waited in quiet, restrained anticipation.

Time passed. Though he always tried to level his expectations, it was hard to disallow the slight disappointment and frustration he began to feel. Sans feeling a bit warm, he hadn't noticed anything unusual! With a grumbled sigh, a padded palm pushed off the hardwood, easing himself to his feet.

Dizzy. Dizzy hot dizzy dizzy.

Spike blinked and stammered, a wave of heat and disorientation flooding over his senses and his flesh. He managed to stay upright, but not without a couple stammered steps. His breathing grew shallow and eager, blurry eyes trying to focus on any one thing, to little avail! Everything around him was leaving trails, pulsing and shifting and waving. He felt like every object was reverberating and those little ripples and shifts were flooding into his heavy body in the form of heat! Focused. Blurry. Focused blurry hot.

The weight of his form and his limbs quickly grew overwhelming! He sat right back down with a heavy thud, tail poked between his splayed legs. Idle hands rubbed up and down his sides, pulses and jets of heat and sensation coursing through his body, letting his heavy head loll. His mind was fragmented, unclear, but happy! Warm! Smooth! Spike didn't feel any fear; though he couldn't manage cogent thought, his velvety scutes and smooth scales were immensely pleasing to his sensitive palms. A drooling tongue hanged casually over his chin, glassy eyes staring at nothing in particular.

Slinking, wandering hands slipped further down, enjoying the tactile sensation of his own pliant scales. Aching fingers pushed down, and with a gasp and a squirm he pushed against his own hemipenes! His mind was swirling and so overwhelmed he hadn't even felt his dual members pop gently out of his scutes! Grasping fingers snaked around the twin erections, hot and already slick with pre. He gasped at the jolt of sensation, pulling the two of them together, both hands clumsily stroking his aching cocks. His motions were slow, indulgent, enjoying the sensations coming from his small members, from the wet flesh sliding against his hands through the overwhelming disorientation overtaking his mind.

One finger slipped between his two shafts, the others remained on either side as he pumped a shuddering grip up and down himself, reveling in the slow sensations with groans and moaned little gasps. The other hand framed the base of his cocks, thumb pressing down and grip pulling up. He could feel the gentle swell of either of his knots; he could feel his rapid, desperate pulse; he could feel the steady, constant dribbling of clear liquid from his tips, trailing messily down his hands and onto his stomach and tail; he could feel every little touch and shift and twitch and motion!

"Spike, you in there?" Twilight called out.

Oh fuck.

Spike was still completely disoriented and dizzy, but that much of a danger alert was enough to snap ANYPONY to their senses! His hands immediately released his twitching shafts, like he'd picked up something without realizing there was a spider on it. He stumbled up to unstable legs, quietly cursing downwards and telling his hard-ons to just go away, go away right now not right now ffuck!!

But Spike went rigid as a board as the door opened, and Twilight Sparkle nosed her way in.

"Oh, there you are Spike! You didn't answer when I called," she remarked, shaking her hide a little, stretching a wing.

"O-oh, yeah, s-sorry Twi, I guess I didn't hear you...!" Spike stammered, frantic gaze darting in between dead ahead of him and down to his stubborn little pricks. His pre-soaked hands stood stiff at his sides, afraid to move at all.

Twilight didn't seem to really register his reply. She walked to the opposite side of the room, inspecting some inventory of bottles, before the reality of the situation began to sank in.

"...Spike, what are you doing in here anyway?"

"N-Nothing! I... couldn't find... something!" he spat out, stumbling over his words. Her sudden intrusion had certain scared him a LITTLE sober, but everything was still pulsing, still waving, still dizzy hot sensitive.

To that, Twilight cocked an eyebrow, her young companion's unusual behavior slipping more and more to the precipice of her mind. Studious eyes scanned the room before her, noting the slight tremble in Spike's form -- but the real object of her interest was the empty Erlenmeyer flask on the desk before her.

Twilight swallowed a growing lump in her throat, hind legs shifting a little, voice cracking.

"So um, Spike?"

"Y-yeah?"

"You didn't happen to drink a potion of mine, would you have...?" She didn't move, she didn't chase the statement. She simply let it hang in the air, already knowing the reply.

Spike flinched, biting his lower lip as his mind raced.

"N-now why would I just... drink one'a yer potions, Twi...?" he dodged.

Despite Spike's altered state of mind, even he could perceive the unusually dark tone in Twi's chuckle. For the first time since he became so intoxicated, he was confused.

"Well... I can't help but notice one of my potion bottles is empty, and that's certainly not the one I drank."

Ahh, busted! Spike's mind hollered at himself, visibly flinching. He shuddered that much more intensely (stubborn pair of erections remaining ever-stalwart), feeling Twilight's fiery gaze apprehending him. But, between the panic and the confusion, a single point of clarity managed to rise through the depths of his mind.

Wait. 'that's certainly not the one I drank'? he repeated to himself in his head.

Another dark chuckle from Twilight, and that mixed with his confusion caused Spike to crane his neck, still doing his best to keep his cocks pointed anti-Twilight. He repeated the confusing statement back.

"That's certainly not the one I drank?? You dr--"

Spike swallowed hard, cut off midsentence by Twilight's calm approach. The leathery, dropped cock hanging and twitching between her legs probably contributed to his shocked silence, too. Her head was bowed, only her horn and glints of her gaze piercing her bangs, mischievous grin wide in her cheeks. She stretched her wings as she closed the gap between the two bodies; Spike couldn't help but stumble towards her, both hands reflexively darting down to fig-leaf his "excitement" as out of site as they could be.

"Mmhmm, the one I drank," she flicked her ears, "To be honest, my current aim was in the amplification of my magical prowess?"

She looked down sheepishly.

"I guess I, um, accidentally amplified other things."

Twilight's brash nose shoved itself between Spike's shielding arms, pushing them to his sides as a lewd gaze burned all over his shame. He didn't move; all he could do was reflexively gasp at the sheer sensation of the silky fur of her snout against his ever-sensitive scales. His breathing was labored, heavy; he blushed intensely as Twilight hungrily eyed his dual cocks but couldn't bring myself to move his arms to their prior position. His wincing eyes managed to peel open.

"Mm, but from the looks of it, you drank my Mollywart Potion? " she snickered, nose trailing teasingly from his stomach to the crook of his neck. Her voice broke into a pseudo-lecturing manner as she continued, "A diuretic potion whose exact effects are currently being investigated! Appears to cause disorientation and increased blood flow, not to mention a number of interesting dermal effects, heightened sensitivity and elasticity inclusive, " she gave his neck the lightest of nips to be greeted with a moaned yelp from Spike, "and also intense arousal!"

Spike's confused mind didn't know what to do. Seemingly on their own, his heavy arms found their way around Twilight's neck, wet grip matting up her fur, desperate grip grabbing handfuls of her mane. Between puffs of breath, he only managed to spit out, "Tw-Twilight... I'm so hot, aahh..." and moan lewdly.

His actions elicited a moaned response from Twilight! She pressed her forehead against the small of his shoulder, carefully weaving her horn through the path, breathy moans beginning to match his. Her aching groins rolled, her newfound cock swelling at Spike's squirms and groans. She giggled as even light little kisses would draw the loudest of moans, humid little puffs of breath bringing coos and murmurs for more.

In a sudden moment, Spike pushed back from Twilight, catching his breath and wincing, between breaths looking up and muttering a quiet, "Twilight this... this is weird...," conflict and reluctance evident in his eyes.

She cooed sweetly, "Spike, I know you're not yourself right now, so," she darted to his neck, running a soft tongue over him (aaahh!), "...if you want me to stop," she nibbled an earfin lightly (oh, f-fuck!), "...just tell me!"

Spike cried out at her actions, any ounce of reluctant or hesitation immediately melting from his mind.

"N-no, don't!"

"Don't what?!" she said forcefully, eyes getting wider as she nuzzled against his jawline.

"Don't stop!"

Twilight took a sudden step forward, the motion causing Spike to lose his footing and land squarely on his behind. She leered over him, bending down and licking down from his neck teasingly, nose tracing the path.

"Hm, you don't want me to stop?"

"Aaahh, no, don't stop!!," Spike gasped and begged, becoming more and more overwhelmed by the moment. Her every touch was sending a jolt of fire and honey through his veins, causing his poor aching cocks to twitch and beg. Aimless hands found their way to Twilight's chest and forelegs, rubbing and groping whatever they could find.

Twilight's grin was wide, satisfied. Hair dangling down and tickling his belly, her cock flicking and bobbing and aching itself, she took a bold, greedy lick over his entire groin -- lapping over either cock, between them, over his slit and dragging it even down to his sensitive entrance. Spike couldn't help but arch his back and roll his eager hips against her, throbbing dicks desperate for anything they could get!

"Oh, do you want more?" she teased.

"More, more, please oh my fuck more!" Spike pleaded.

A rough hoof pinned Spike's tail spade as her broad tongue set to work, wrapping around his desperate members, lapping and pushing, drinking his copious pre-cum. Her tongue traveled more southwards, though, leaving his eager cocks in lieu of his soft little pucker. A bold tongue licked right over it, once more. Spike couldn't help the gasped moan that wetness and warmth drew from his throat, blushing and moving both hands to try and muffle himself.

"Oh, what, does that feel good?" Twilight almost spat her words.

He couldn't bring himself to reply, embarrassed; he only squinted, blushed, and frantically nodded.

Her tongue lashing grew more intent, squirming tongue pressing at the folds of his tailhole, tugging on it and trying to snake its way inside.

"More, Spike?"

He practically yelled from between tight fingers at her actions, whimpering desperately as her tongue was bringing him so much bliss, despite his embarrassment.

She continued, lips dragging against his skin and tongue rolling and pressing, saliva soaking his tight little ass. She could feel her cock aching, her balls drawing in and growing so tight; with a groan of pleasured frustration, she took an eager few hoofsteps forwards, pinning Spike, blunt, swollen cock head pressing threateningly against his thoroughly-lubricated asshole.

He could feel the heat from her cock; he could feel her leathery flesh and her strong, aching pulse and twitches. She could feel his instinctive flinch, his wincing against her throbbing cock, his squirms and his heat.

"Twilight--!" he yelped, looking down at the looming horsecock. He squirmed against it, mind racing in a million directions as Twilight began to eagerly, lightly roll her hips, the lightest of jabs of her erection begging to shove inside.

"I don't... Twilight, I don't think that'll fit inside me?!"

Twilight just groaned, rolling her hips ever-harder, wide head starting to push against its unyielding target. Spike squirmed and whimpered, biting his lip and grabbing onto Twilight's sides. Her bow buckled and bent a little in her efforts, but still she tried.

"Remember? That potion," she coughed, lusty tone dropping for a faux-educational one, "increased dermal elasticity!"

Shuddering, pushing harder, feeling her head begin to push into the intense heat and wetness of Spike's tail, her tone dropped back to sultry, teasing, "That means you're stretchy. We'll make it fit."

Spike groaned, a mix of anticipation and nerves evident in his still-disoriented mind. His short legs did their best to hitch themselves around Twilight's hips, rocking himself with eager intent against her hard-on. A mix of Twilight's saliva and her pre were making her efforts easier as she leaned down, pinning her chest against his as her hips bucked more, harder. At first she'd been doing her best to be slow, gentle, yielding - but as desire grew, as that little pucker of him pressed and squeezed and teased against her pulsing head, she grew harsh, more intent.

Twilight grew impatient. Her rear hoof stepped on Spike's keratinous tail spade; with a pensive, shuddered voice, she instructed, "Spike, deep breath on three, okay?"

Spike nodded against her chest. Through eager moans, he managed a big gulp of air; however, it was cut short. Twilight groaned as her throbbing cock finally pushed past the threshold, spreading Spike's tight asshole wide around it, burying itself in the hot, drooling depths of Spike's behind. The duo shared a cried yell! Spike's back arched, entire form shaking with absolutely blinding heat, pleasure, sensation! The heat for both parties was overwhelming, Spike's pucker squeezing and nursing on the first few invading inches of Twilight's impressive, dark length. Twilight's cock could feel every shift, ripple, every heartbeat of Spike's now that she was inside him.

"Oh my fuck!!" Spike yelled, eyes rolling in the back of his head, careless tongue lolling out of his mouth, his twin members swollen past the point Spike thought they could ever grow. His moans were sweet, needy, his voice one of pure ecstasy. The sheer girth of Twilight's cock astonished him, the fact he was stretched around something almost the width of his tail! He already felt stuffed so, so full, and she was only a few inches in!

"You're so tight, fuck!," she spat, lust driving her aching, bucking hips at this point. Hind hooves dug into the flooring, desperately trying to convince as much of her length into the dragon's rear as she could manage. Each buck, each throw of her form managed to coerce a little bit more in, shove it a little bit deeper in his squeezing, clamping depths. Some quiet part of her mind was concerned with the little guy's safety, naturally, but sheer instinct and lust were driving Twilight to hilt as much of her throbbing, pulsing cock into Spike as he could fucking take!

It didn't take long for Spike to loosen up a bit, inch by inch for more and more of her to shove its way into Spike's asshole. Her hips were bucking wildly, tail and mane bobbing, wings aflitter, both parties moaning and gasping to the heavens. His toes dug into Twilight's side, which only drove her on more! Spike's eyes managed to peel open and stare down at the lewd site; those purple flanks rolling and shoving, her slick cock disappearing into his squeezing tailhole, his dicks bouncing in rhythm with her heavy balls, and -- Spike gasped with lust and pleasure -- on the particularly deep strokes, Spike could swear he saw the faint silhouette of that fat cock head pushing eagerly against his stomach!

Spike's iron grip released from Twilight's neck, reaching down to push against his own stomach. Twilight gasped on the upstroke, too, feeling her cock press distinctively against those little clawed fingers!

"Haah, hah, holy shit Spike!" Twilight groaned, "How's it feel?"

"It feels amazing!! Harder, oh fuck, deeper, fuck me hard!" Spike cried out, palms pushing down against her pressing head.

That was all the encouragement Twilight needed, bucking that much faster. The heat of Spike's innards, his tightness, the wetness, his moans, the pressure, it was all getting to be too much! She felt her testes draw up a little; she felt her stomach growing tighter, a pressure building up in her cock head. She leaned more into her bucking, hips rolling, pussy winking and drooling with pleasure.

"Spike, shit, I'm gonna -- I'm gonna cum, oh fuck I'm gonna cum!"

"Yes, please, oh fuck Twilight! Pump me full, come on, fuuuck I wanna feel it, more, more more!!"

That was enough to shove Twilight over the edge of pleasure. With a final few heroic thrusts, she threw her head back, crying out as she felt her cock suddenly stiffen and flare! It swelled so intensely, spreading and filling Spike that much fuller -- but that was even before she came. One last enormous pulse heralded her, and with that, her flared, shuddering member spilled it seed into Spike's asshole. Jet after jet of sticky, hot seed poured out of her, seemingly endlessly. Six, seven jets in and Spike was squirming and crying out to anyone that would listen, hands still pressing against his now-swelling stomach as his small body was pumped full with more cum that he thought possible! Ten, eleven! He could feel his growing belly pulse, grow, push against his grip as more and more hot cum filled it!

Twilight cooed and moaned as she rode her orgasm out, nursing that still-twitching cock in Spike's body. Both parties gasping for air, with one last shuddered sigh, she pulled her still flared cock slowly out. The wide brim of her cock caught the tightening ring of Spike's entrance, but with a little more effort, she pulled her flare out with a satisfying little pop.

Spike's spent, messy asshole gaped as she pulled out, a huge gush of her cum immediately trailing her cock and spilling all over his tail and the floor; he didn't particularly care. Groping hands still wandered and caressed his cum-swollen stomach, enjoying the tightness, the fullness. His stomach even pressed down against his ever-erect cocks (which were currently aching worse than they've ever ached before in the dragon's short but eventful life).

Twilight sat, spent, on her haunches. "H-holy shit Spike..."

He nodded and cooed in reply, laying on his back. But it didn't take long for the disoriented dragon to rouse, carefully maneuvering around his sloshing belly. "Twi, I gotta... holy shit, I've never needed to get off worse in my life, oh my fuck, I need to cum," he whined.

Still catching her breath, Twilight snickered and grinned, seeing his dual dicks indeed still twitching and dripping. She wordlessly hoisted one leg up, presenting the soaked pussy tucked right behind her ballsack, still-twitching cock draped over her resting thigh. "Your turn, then!"

Spike didn't need another ounce of coaxing. Unsteady legs closed the short distance between the two of them, belly jiggling and sloshing all the way. He wrapped his arms around her lifted haunch happily, hands kneading her squishy thighs. He was too frantic to aim, to care; he began jabbing away recklessly with his needy cocks, slick with pre and Twilight's fluids! His belly shifted along with his motions, and his fire-hot members slipped up against Twilight's heat, rubbing against a swollen clit and puffy lips. His motions were erratic; one cock would slip into Twilight's eager pussy, sometimes both; sometimes neither would and he's simply frot to joy against her soaked lips; sometimes a shaft might prod her asshole and push its desperate tip in.

Twilight gasped and giggled at his desperate motions. Sure, he wasn't the most impressively hung stallion in Equestia, but his intent, his fire and his passion made it all the more wonderful. She rolled her soft haunches back against her needy lover, eventually resting her heel on his shoulder. His hands darted over to her semi-flaccid member, taking it into his arms and pulling it against his body. Both hands stroked its length as his drooling lips wrapped around her still-cum-soaked cock, sucking and nursing against her head as his cocks frotted away.

In possibly the least surprising event in all of history, Spike didn't have long to last. After being fucked silly by Twilight, after beginning to jack himself off before she entered the room, after feeling his stretchy belly stuffed to the absolute brim with Twilight's white-hot cum, he felt his two knots finally swelling. In a cry of almost relief, he shouted, "Twilight, I'm cumming, yes, yes yes yesss!"

His knees almost buckled as Spike shoved himself forward, burying his hemipenes into wherever they'd fit as he felt the overwhelming sensation of his seed spurting out of his tips. Incidentally, both his cocks ended up buried nice and tight in Twilight's pussy, to be greeted with a cooed moan! He whimpered, jabbing his hips forward over and over again, forcing and milking every drop he had to offer into Twilight's tight cunt as it squeezed around his pulsing knots!

After a few moments, a spent Spike collapsed forward into Twilight's lap with moaned, satisfied breaths. Twilight couldn't stay upright for long; she flopped back onto the floor in short order. Spike merely lay atop her for a bit, cocks still pressed against Twilight's messy pussy, belly still fully of cum.

After a pause, Spike spoke up.

"Twilight? Um... I still feel... really dizzy. How long are these potions supposed to last?"

Twilight laughed grimly, giving pause before reply, "...why don't we find out, Spike?"

*****